FW: [OFF TOPIC] [rtl] how to amplify the signal from the detector?

["Dresner, Norman A." <norman_a_dresner@md.northgrum.com>]

At that sensitivity, power-supply noise becomes significant.  While a really
good quality lab supply can meet the requirements, you can do a lot worse
than to use a pair of 9v batteries.  There's NO noise except what your
wiring picks up from the environment.

	Norm

> -----Original Message-----
> From:	Tomasz Motylewski [SMTP:motyl@stan.chemie.unibas.ch]
> Sent:	Thursday, October 07, 1999 5:26 PM
> To:	ahgu
> Cc:	RtLinuX (rtl)
> Subject:	Re: [OFF TOPIC] [rtl] how to amplify the signal from the
> detector?
> 
> On Thu, 7 Oct 1999, ahgu wrote:
> 
> > Wonder if anyone encountered the signal amplification problem. My
> detector
> > give out slow-varying DC signal in couple mV range. My A/D board reads
> 0-5V
> > and I need all the 16bit resolution. Where would I get a DC amplifier to
> 
> Look at the list at http://www.xs4all.nl/~ganswijk/chipdir/f/amp.htm
> and choose some high precision low noise stable instrumentation amplifier.
> 
> I have been using OP07, but there are probably better ones.
> See http://www.analog.com/pdf/op07.pdf
> 
> Be aware that 16 bits at 5 mV means 76 nV precision. So your amplifier
> should
> be attached directly to the detector, everything well shielded, stable
> (good
> resistors, possibly temperature stabilised, some RC filter to reduce the
> higher frequency noise). If signal changes slowly, avaraging lots of
> samples
> will reduce noise significantly. In my experience, getting noise below 0.1
> mV
> might be very tricky.
> 
> Best regards,
> --
> Tomek
> 
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